监控log文件变化进行读出变化的内容供分析的源码类

来源：互联网发布：nc 数据库修改凭证编辑：程序博客网时间：2024/05/22 04:44

监控log文件变化进行读出变化的内容供分析的源码类

头文件：

#pragma once//#define  DEBUG_MONITORING_FILE_CHANGES#ifdef DEBUG_MONITORING_FILE_CHANGES#include "CiteConsole.h"#endif//定义获取到新的内容事件typedef void (CALLBACK* ONREADNEWCONTENT)(void* pOwner, const CString* strBuf, DWORD dwBufLen);class CLogFileMonitor{public:CLogFileMonitor(void);public:~CLogFileMonitor(void);/*--向上层的回调事件--*///读取到新的数据事件，回调函数ONREADNEWCONTENT OnReadNewContent;private://线程退出事件句柄HANDLE m_exitThreadEvent; //线程句柄HANDLE m_MonitoringThreadHandle;//父对象句柄void * m_pOwner;private:static DWORD WINAPI  MonitoringThreadFunc(LPVOID lparam);BOOL Close();// 文件读取的成员和方法private:LONGLONG m_lOff; //记录读取的文件的位置ULONGLONG m_lActual;//seek实际到达的文件位置CString m_strFilePathName;CStdioFile m_file;BOOL m_blOpenSucess;void OpenFile();void ReadNewLine();public:void Init(CString strFileName, void* pOwner, void* OnReadNewContentFun);};

源文件#include "StdAfx.h"#include "LogFileMonitor.h"CLogFileMonitor::CLogFileMonitor(void){OnReadNewContent = NULL;m_pOwner = NULL;m_lOff = 0;m_lActual = 0;m_blOpenSucess =FALSE;//创建线程退出事件句柄CString strEventName;strEventName.Format(_T("EVENT_FILE_MONITOR_THREAD%d"), this);m_exitThreadEvent = CreateEvent(NULL,FALSE,FALSE, strEventName);//创建通讯线程m_MonitoringThreadHandle = CreateThread(NULL,0,MonitoringThreadFunc,this,0,NULL);}CLogFileMonitor::~CLogFileMonitor(void){Close();//关闭线程退出事件句柄CloseHandle(m_exitThreadEvent);Sleep(1000);if (m_blOpenSucess && m_file ){m_file.Close();printf("文件关闭");m_blOpenSucess = FALSE;}m_blOpenSucess =FALSE;}DWORD WINAPI CLogFileMonitor::MonitoringThreadFunc(LPVOID lparam){CLogFileMonitor *pThis = (CLogFileMonitor*)lparam;while (TRUE){//收到退出事件，结束线程if (WaitForSingleObject(pThis->m_exitThreadEvent,0) == WAIT_OBJECT_0){break;}pThis->ReadNewLine();}TRACE(L"CMonitoringFileChanges线程退出\n");return 0;}void CLogFileMonitor::Init(CString strFileName,void* pOwner, void* OnReadNewContentFun){m_strFilePathName = strFileName;m_pOwner = pOwner;OnReadNewContent = (ONREADNEWCONTENT)OnReadNewContentFun;}void CLogFileMonitor::OpenFile(){m_blOpenSucess =  m_file.Open(m_strFilePathName, CFile::modeRead |CFile::shareDenyNone);if (!m_blOpenSucess){printf("监控log文件失败");}}void CLogFileMonitor::ReadNewLine(){if(!m_blOpenSucess){Sleep(100);OpenFile();if (!m_blOpenSucess){return;}}if (m_lOff != m_lActual){Sleep(200);}else{Sleep(300);}CString strText = _T("");CString szLine = _T("");if (m_file ==NULL){return;}if (!m_blOpenSucess){return;}if (m_file.m_pStream != NULL){m_lActual =  m_file.Seek(m_lOff,CFile::begin);//逐行读取字符串while( m_file.ReadString( szLine ) ){if (m_pOwner && !szLine.IsEmpty()){OnReadNewContent(m_pOwner, &szLine, m_lActual);}szLine = _T("");}m_lOff = m_file.Seek(0, CFile::current);}}BOOL CLogFileMonitor::Close(){//发送通讯线程结束事件SetEvent(m_exitThreadEvent);//等待1秒，如果读线程没有退出，则强制退出if (WaitForSingleObject(m_MonitoringThreadHandle,1000) == WAIT_TIMEOUT){TerminateThread(m_MonitoringThreadHandle,0);TRACE(L"强制终止客户端线程\n");}m_MonitoringThreadHandle = NULL;//关闭文件，释放资源return TRUE;}

使用的时候，实现回调就可以在回调里面获取最新获取的变化量；

还有可以改进的思路就是：

每次都进行打开，并且每次都关闭，这样可以尽量不影响原来其他程序对log文件的操作。

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